Made out of high quality PVC plastic, this plastic cover will help keep your metal extrusion free of dust and debris. For use in our 15 or 40 Series extrusions, this will fit in an T-Slot opening of .320" or 8.13mm. Hard cover for your extrusion profile, they are oderless and come in a varity of colors. Sold in lengths of 72.5" long but can easily be cut to your desired length. Slot covers adds a great finishing touch to your DIY project, 3D printer, workbench, office desk, CNC machines and many more! The economy T-slot cover is a cost-effective way to add a finishing touch and polished look to an application. It prevents dust and debris build up and covers wires and tubes in the T-slot channel. Tip: Use a soft face mallet to tap the cover into the T-slot.